MachineFunctionProperties/MIRParser: Rename AllVRegsAllocated->NoVRegs, compute it

Rename AllVRegsAllocated to NoVRegs. This avoids the connotation of
running after register and simply describes that no vregs are used in
a machine function. With that we can simply compute the property and do
not need to dump/parse it in .mir files.

Differential Revision: http://reviews.llvm.org/D23850

llvm-svn: 279698
diff --git a/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp b/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp
index 7b10654..e0798bf 100644
--- a/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp
+++ b/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp
@@ -60,7 +60,7 @@
 
   MachineFunctionProperties getRequiredProperties() const override {
     return MachineFunctionProperties().set(
-        MachineFunctionProperties::Property::AllVRegsAllocated);
+        MachineFunctionProperties::Property::NoVRegs);
   }
 
   void insertDefsUses(MachineBasicBlock::instr_iterator MI,